SS21A8 (C₂H₅OH) Electrochemical Ethanol Sensor (0–0.4% BAC)

The SS21A8 is an electrochemical ethanol sensor capable of detecting ethanol concentrations from 0 to 0.4% BAC. With a fast response time under 10 seconds and excellent linearity, it delivers precise and reliable readings with a resolution of ≤0.001% BAC. This sensor shows minimal cross-sensitivity to gases such as NH₃, CO, and H₂S, making it ideal for use in portable breathalyzers, industrial alcohol detection, and safety monitoring systems. It operates reliably within -20℃ to +50℃ and offers a service life of over 24 months in air.
- Measuring Range: 0–0.4% BAC (Max overload: 0.6% BAC)
- Output Signal: Varies by sample volume
- Response Time: Less than 10 seconds (to 5% recovery)
- Resolution: ≤0.001% BAC (circuit dependent)
- Linearity/Repeatability: Excellent linearity, repeatability ≤ ±3%
- Operating Temperature: -20℃ to +50℃
- Service Life: ≥24 months (in air)
- Low Cross-sensitivity: NH₃, CO, H₂S: 0%

Performance Characteristics
Output Signal	Depends on sample volume
Measurement Range	0~0.4% BAC
Maximum Overload	0.6% BAC
Response Time (Clear to 5% of peak)	~ 10 seconds
Linearity	Linear
Repeatability	≤ ±3%
Recommended Load Resistor	10 ohms
Resolution (Electronics Dependent)	≤ 0.001% BAC
Environmental
Temperature Range Continuous	-20℃ to +50℃
Operating Humidity Range	15% to 90% RH
Lifetime
Long Term Output Drift	≤ 5% per annum
Recommended Storage Temp	0℃ to 20℃
Expected Operating Life	≥ 24 months in air
Standard Warranty	24 months from date of dispatch

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